Founded in 2007, China Railway Construction Heavy Industry Co Ltd (CRCHI) is affiliated to China Railway Construction Corporation (CRCC), which ranks 80th in the world´s top 500 enterprises.
CRCHI is a professional enterprise, which integrates research, design, manufacture and service of high-end underground engineering equipment and track equipment. Currently, CRCHI has multiple manufacturing bases in Changsha, Zhuzhou, Longchang and Lanzhou as well as 11 research institutes in Changsha, Beijing and Lanzhou, etc. The company´s tunnel boring machines (TBM) rank ahead of the market, which has been widely used in tunnel infrastructure construction of national defense, traffic system, coal mines, hydro power and municipal engineering.
At present, the company´s products have been exported to more than 30 countries, which include North American and in Europe. And, with a capacity to manufacture 20 large TBMs at the same time, the company can manufacture TBMs of up to 16 m diameter.
TBMs manufactured by CRCHI include:
Earth Pressure Balance Shield (EPB): This self-designed EPB is particularly used for binding grounds with a height content of clay, loam or silt, which have low water permeability. Its excavation diameter ranks from 2 m to 16 m.
Slurry Pressure Balance Shield: Its features depend on the interaction between the pipeline´s throughout and the TBM advance rate to ensure that the support pressure of the slurry can be controlled precisely. The excavation diameter of CRCHI SPB ranks from 2 m to 16 m.
Hard Rock Shield (open type TBM): Full face hard rock shield of CRCHI, an advanced new developing machine, has been researched on the technologies of large diameter TBM in the project of ´863´ National Program. Its advancing depends on a rotation cutting wheel equipped with tools to excavate the tunnel face and crush the inner rocks to cast an entire excavated face, which is mainly for the tunnel construction with the solid layer contents of gravels, marbles, granites, etc. It is an efficient giant machine with the multi-function of drilling, detecting, tunneling, mucking transport, anchor support and dust ventilation. Compared to the method of explosion, the hard rock shield react in a more efficient, optimised, safe and low pollution way and is widely used in tunnel infrastructure construction of national defense, traffic system, coal mines, hydro power and municipal engineering. The excavation diameter of CRCHI Hard Rock Shield ranks from 3 m to 15 m.
Special Function TBM: Dual Mode Inclined Shaft TBM is a full face tunnel boring machine possessing of both EPB and Single Shield, to gather with slagging of screw conveyor and continuous belt conveyor, special for the geologies and construction demand of coal mine. It´s a new type high performance TBM, which has been researched by CRCHI under the support plan of ´Key Technology of Long Construction Coal Mine´, particularly for the geological feature of inclined shaft tunnel construction. As compared to the old method of explosion, freezing tunneling and expansion digging, the inclined shaft TBM are more efficient and have an advantage of low pollution, shorter period during the construction, which starts a new age of coal mine exploit and completes the categories of TBM. The excavation diameter of the Dual mode inclined shaft TBM ranks from 2 m to 15 m.